摘要
碳酸盐矿物是旬黄地区长6砂岩中最主要的胶结物。主要包括方解石、铁方解石、白云石和铁白云石。镜下观察表明该地区长6砂岩碳酸盐胶结物可分为明显的早、中、晚三期,其主要呈充填粒间孔隙和泥微晶环边形式存在。通过对该地区长6油层组岩石薄片、碳氧同位素等测试分析,表明其主要碳酸盐胶结物为铁方解石。碳酸盐胶结物δ13CPDB值为-3.34‰~2.6‰,δ18OPDB值为-21.57‰^-12.06‰,其形成与有机酸的进入有关。
Carbonate cements are the main mineral in the sandstone of Chang 6 member in Xunyi-Huangling area, Ordos Basin. The main types of carbonate cements are calcite, dolomite, ferrodolomite and ferrocalcite. The microscopic observation of Chang 6 member in this area shows that the carbonate cements in these sandstones can be subdivided into three kinds including early, middle and last phases according to their textural relation and composition. They occur as pore-filling cement and thin rim surrounding grains. The thin sections were analyzed, and the carbon and oxygen isotopes of carbonate cements were tested. The results indicate that the carbonate cements of Member 6 of Yanchang Formation are mainly ferrocalcite. The results of the carbon and oxygen isotopes of the carbonate cements and fluid inclusions show that δ13CpDB value is -3.34‰ - 2.6‰, and δ18OpDB -21.57‰ -- -12.06‰, the main source of carbonate cements is related to the organic acid.
出处
《辽宁化工》
CAS
2015年第1期83-85,94,共4页
Liaoning Chemical Industry
基金
陕西省教育厅专项科研计划项目(14JK1567)
西安石油大学博士科研启动项目(207003)
关键词
碳酸盐胶结物
碳氧同位素
长6砂岩
旬黄地区
carbonate cement
carbon and oxygen isotopes
Chang 6 sandstone
Xunyi-Huangling area
